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Answer for the clue "An X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast ", 19 letters:
pneumoencephalogram

Word definitions for pneumoencephalogram in dictionaries

Wiktionary Word definitions in Wiktionary
n. An image produced by means of pneumoencephalography.

WordNet Word definitions in WordNet
n. an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast [syn: encephalogram ]

Usage examples of pneumoencephalogram.

A PEG, or pneumoencephalogram, consists of draining all the cerebrospinal fluid and pumping in air to increase contrast in the ventricles.